mycom 3225MSC

2202MYJE-MY-C8-N_2018.02.
Table of Contents
Compound 2-stage Screw Compressor 3225**C
vi
2.5 Mechanisms ............................................................................................... 2-18
2.5.1 Basics of the Screw Compressor ...................................................................... 2-18
2.5.2 Suction Process ................................................................................................. 2-18
2.5.3 Compression Process ........................................................................................ 2-19
2.5.4 Discharge Process ............................................................................................. 2-19
2.5.5 About Volume Ratio (Vi) .................................................................................... 2-19
2.5.6 Capacity Control Mechanism ............................................................................. 2-21
2.5.7 Bearings and Balance Piston ............................................................................ 2-21
2.5.8 Shaft Seal Block ................................................................................................ 2-21
2.6 Gas and Oil Flow ........................................................................................ 2-22
Chapter 3 Installation
3.1 General Precautions for Installation .......................................................... 3-1
3.2 Installation Works ........................................................................................ 3-1
3.2.1 Unpacking ............................................................................................................ 3-1
3.2.2 Storage ................................................................................................................ 3-1
3.2.3 Transportation ...................................................................................................... 3-1
3.2.4 Preparation for Installation ................................................................................... 3-4
3.2.5 Installation ............................................................................................................ 3-5
3.2.5.1 Installation .................................................................................................... 3-5
3.2.5.2 Shaft Alignment between the Compressor and Driving Machine ................ 3-5
3.2.5.3 Piping Connection ....................................................................................... 3-6
3.2.5.4 Equipment and Devices for Protection of the Compressor ......................... 3-6
3.2.6 Airtightness Test .................................................................................................. 3-7
3.2.7 Lubricating Oil Charge ......................................................................................... 3-7
3.2.7.1 Initial Charge of Lubricating Oil ................................................................... 3-7
3.2.7.2 Additional Charge of Lubricating Oil ............................................................ 3-7
3.2.8 Charge of Refrigerant .......................................................................................... 3-7
3.2.9 Check after Installation ........................................................................................ 3-7
Chapter 4 Compressor and Package Unit Operation
4.1 Lubricating Oil (Refrigerant Oil) ................................................................. 4-1
4.1.1 Precautions for Selecting the Lubricating Oil....................................................... 4-1
4.1.2 Recommended Lubricating Oils .......................................................................... 4-1
4.1.2.1 Recommended Lubricating Oils for Ammonia Refrigerant .......................... 4-1
4.1.2.2 Oils for systems using Hydrofluorocarbon refrigerants ............................... 4-2
4.1.3 Change of Lubricating Oil Brand ......................................................................... 4-3
4.1.4 Precautions for Handling lubricating Oil .............................................................. 4-4
4.1.5 Lubricating Oil Management Criteria ................................................................... 4-5
4.1.6 Lubricating Oil Replacement Timing .................................................................... 4-6
4.1.6.1 After Starting the Initial Operation ............................................................... 4-6
4.1.6.2 During Normal Operation............................................................................. 4-6